Lady Macbeth - The Power Behind the Throne
Lady Macbeth is one of Shakespeare's most ambitious female characters, and she's absolutely ruthless in pursuing power. She's the driving force who convinces her husband to murder King Duncan, showing her manipulative skills at their peak.
Her famous soliloquy "come you spirits that tend on mortal thoughts, unsex me here" reveals her desire to become more masculine and ruthless. She calls Macbeth "too full of the milk of human kindness," showing she sees his conscience as weakness.
Lady Macbeth orchestrates Duncan's murder, telling Macbeth to "be the innocent flower but be the serpent underneath." However, guilt eventually destroys her - she sleepwalks, trying to wash imaginary bloodstains while crying "out damned spot." The woman who seemed so strong ultimately commits suicide.
Remember: Lady Macbeth starts powerful but ends powerless - her arc shows how guilt can completely break even the strongest people.